president obama spoke again this morning. >> if you want to know who we are, what america is, how we spend to evil, that is it: selflessly, compassionately, unafraid. >> authorities spend the night in a residence near the airport and they have been having conversation with a saudi man who is considered a "person of interest" but so far, still, no suspect. >> thank you. we want to add, new reports say the explosives were a pressure cooker packed with nails and other fragments, and this is from our reporter and the crew in boston. the memorial is growing at the finish line of the marathon and armed officers patrol the streets with tanks. the street between the two blast sites is barricaded and it is a bit of a tourist attraction with hundreds of people showing up to see what is going on. beyond the barricades, the street is filled with trash and debris. normally it would be cleaned but it is left for investigators to sort through because they dope want to overlook any part of key evidence that could lead them to the bomber. >> the youngest bombing victims is from here in the bay area,